package com.zcdom.framework.util;

import com.zcdom.framework.shiro.realm.UserRealm;
import com.zcdom.system.entity.User;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.crypto.SecureRandomNumberGenerator;
import org.apache.shiro.mgt.RealmSecurityManager;
import org.apache.shiro.session.Session;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.subject.SimplePrincipalCollection;
import org.apache.shiro.subject.Subject;

public class ShiroUtils {

    public static Subject getSubject() {
        return SecurityUtils.getSubject();
    }

    public static Session getSession() {return SecurityUtils.getSubject().getSession();}

    public static void logout() {
        getSubject().logout();
    }

    public static User getUser() {
        return (User) getSubject().getPrincipal();
    }

    public static void setUser(User user){
        Subject subject = getSubject();
        PrincipalCollection principalCollection = subject.getPrincipals();
        String realmName = principalCollection.getRealmNames().iterator().next();
        PrincipalCollection newPrincipalCollection = new SimplePrincipalCollection(user, realmName);
        // 重新加载Principal
        subject.runAs(newPrincipalCollection);

    }

    public static void clearCachedAuthorizationInfo(){
        RealmSecurityManager rsm=(RealmSecurityManager) SecurityUtils.getSecurityManager();
        UserRealm realm=(UserRealm) rsm.getRealms().iterator().next();
        realm.clearCachedAuthorizationInfo();
    }

    public static Long getUserId() {
        return getUser().getId().longValue();
    }

    public static String getIp() {
        return getSubject().getSession().getHost();
    }

    public static String getSessionId() {
        return String.valueOf(getSubject().getSession().getId());
    }

    /**
     * 生成随机盐
     */
    public static String randomSalt() {
        // 一个Byte占两个字节，此处生成的3字节，字符串长度为6
        SecureRandomNumberGenerator secureRandom = new SecureRandomNumberGenerator();
        String hex = secureRandom.nextBytes(3).toHex();
        return hex;
    }
}
